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Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Period-end Account Balances with Non-consolidated Affiliates) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Related Party Transaction [Line Items]    
Accounts receivable - related parties $ 53us-gaap_AccountsReceivableRelatedPartiesCurrent $ 54us-gaap_AccountsReceivableRelatedPartiesCurrent
Other long-term assets-related parties 15us-gaap_DueFromRelatedPartiesNoncurrent 12us-gaap_DueFromRelatedPartiesNoncurrent
Accounts payable-related parties 44us-gaap_AccountsPayableRelatedPartiesCurrent 53us-gaap_AccountsPayableRelatedPartiesCurrent
Equity Method Investee [Member]    
Related Party Transaction [Line Items]    
Accounts receivable - related parties 53us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
54us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
Other long-term assets-related parties 15us-gaap_DueFromRelatedPartiesNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
12us-gaap_DueFromRelatedPartiesNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
Accounts payable-related parties $ 44us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
$ 53us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember